21038334 has 16 divisors (see below), whose sum is σ = 42126480. Its totient is φ = 7004480.

The previous prime is 21038327. The next prime is 21038341. The reversal of 21038334 is 43383012.

It is an interprime number because it is at equal distance from previous prime (21038327) and next prime (21038341).

It is a super-2 number, since 2×21038334² = 885222994991112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5602 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (2632905).

Almost surely, 2^21038334 is an apocalyptic number.

21038334 is an abundant number, since it is smaller than the sum of its proper divisors (21088146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21038334 is a wasteful number, since it uses less digits than its factorization.

21038334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4155.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21038334 is about 4586.7563702468. The cubic root of 21038334 is about 276.0601895615.

The spelling of 21038334 in words is "twenty-one million, thirty-eight thousand, three hundred thirty-four".